SELECT TOP 25 Reputation,Id as [User Link],(Reputation/DA...

SELECT TOP 25 Reputation,Id as [User Link],(Reputation/DATEDIFF(mm,CreationDate,GETDATE())) AS ACC from Users
WHERE DATEDIFF(mm,CreationDate,GETDATE()) !=0
ORDER by (Reputation/DATEDIFF(mm,CreationDate,GETDATE())) DESC